Electrically-heated stove.



T. s. PERKINS m. Ef-ROSE.

ELEOTRIOALLY HEATED STOVE.

APPLICATION FILED JULY 24, 1911.

1 A [Ill/Ali A aiii ATTORNEY UNITED STATES PATENT OFFICE.

THOMAS S. PERKINS, OF PITTSBURGH, AND EDWARD E. ROSE, OF SWISSVALB, PINN- SYLVANIA, ASSIGNORS TO WESTINGHOUSE ELECTRIC AND MANUFACTUBIKG COMPANY, A CORPORATION OF PENNSYLVANIA.

ELECTRICALLY-HEATED STOVE.

To all whom it may concern .1

Be it known that we, THOMAS S. PERKINS and EDWARD E. RosE, citizens of the United States, and residents, respectively, of Pitts. burgh and Swissvale, both in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Electrically-Heated Stoves, of which the following is a specification.

Our invention relates to, electrically heated stoves or the like, and it has for one of its objects to improve and simplify the construction. and operation of devices of the aboveindicated character and to provide a unitary structure having a switching device permanently mounted beneath it and adapted to be operated from the side of the stove.

Another object of our invention is to provide adequate means for protecting the switching device against excessive temperatures.

It is the usual practice to provide electrical heating apparatus with means for controlling the electrical connections thereof that constitute separate devices to be connected to the service cord. This arrange ment is cumbersome and inconvenient'and it is partially to avoid this. difliculty that our invention is provided.

According to our invention, we secure a quick-break switching device to the under side of the stove where it occupies a space which is not usually utilized, and also preserves a symmetrical and neat appearance, and we arrange to operate this device from the exterior of the stove through the agency of suitable shafts and cooperating gearing. Furthermore, we provide a casing or shell embodying an air space or chamber and havg a deep annular groove or recess on its said casin bein inter osed be- Specification of Letters Patent.

' Application filed July 24, 1911. Serial No. 640,288.

heater unit and the switch device.

PatentedMar. 17, 1914.

reference to the which F .igure 1 is a view, partially in side elevatio'n and partially in section, or" a. device constructed in accordance with our invenaccompanying drawing, in

tion, and Fig. 2 is a plan view of the app 'aratus shown in Fig. 1, a portion thereo mg broken away. 7

Referring to the drawings, an electrically heated-a device 1, comprises a circular topplate or working member 2, a circular heater unit 3 su1tably secured beneath the plate, a substantially cylindrical shell or casing 4 to which the plate 2 and the heater unit 3 are Inasmuch as the arrangement and structure of the heater unit is shown and described in detail in Patent No. 890,856. granted June 16, 1908, to the Hadaway Electric Heating & Engineering Co., a further description thereof is considered unnecessary. Y

The heater unit 3 is provided with a plurality of leads 13 which "are brought to a suitableterminal board '14 where they are electrically connected to a plurality of insulated conductors 15 which transmit electrical energy from the switching device 5-to the heater unit. It will, of course, be understood that the heater unit 3 may be provided with any number of leads and may be adapted," in conjunction with the switching device 5, for any desired number of different degrees of heat.

The shell or casing 4 comprises an upper portion 14 and a lower portion 15 which are of like construction and which comprise a cylindrical member having a neck portion 16 of materially reduced diameter. The upper and lower portions 14" and 15 are assembled and united with the neck portions thereof in engagement and are suitably held imposition by means of rivets 17 and spacing members 18. By thus assembling the component parts of the shell 4, a deep annular groove or recess 19 is provided which afiords ample exterior radiation and ventilation. As hereinbcfore stated, the walls 20 of the recess 19 are highly polished in order to reflect the heat between them, thus preventing the switching device 5 from being subjected to injurious andexcessive temperatures. Secured to the lower edge of the shell 15, is a bottom plate 21 to which the legs 7 and a handle 22 are attached. The plate 21 is also provided with a centrally located recessed portion 21 to receive the switching device 5, and with a shell or casing 23 for the purpose of inclosing and protecting said switching device.

The switching device 5 is preferably of the quiclchreak type and may be of any suitable construction. Inasmuch as the construction and operation of devices of this class are old and familiar to those skilled in the art, and as this particular device forms no part of. our invention, except as it per forms a necessary function in its operation, we do not deem it necessary to give a further description thereof, This switching device is shown and described in detail in Patent- No. 966,368, granted August 2, 1910, to George B. Thomas and assigned to the Perkins Electric Switch Manufacturing Com-v pany.

A vertical shaft 24:, which is centrally disposed within the structure and is associated with the switching device 0, projects upwardly into the air chamber provided within the casing 4 and is provided with a gear wheel25. The inner end of a horizontally disposed rod or shaft 26 is provided with a' gear wheel 2? to cooperate with the gear wheel 25 and the outer end thereof projects through the side of the casing 15 and is prothrough the inclosing casing 23 and is secured thereto,.se rves to protect the service cable 9, which is electrically connected to the switching device 5, in a f'well known manner,

Such modifications in the structural details and in the arrangement and location of parts as may be effected by those skilled in the art without materially altering the operation or the results secured, are to be understood. as included within the spirit and scope of the appended claims.

We claim as our invention: 4

1. In an electrically heated stove, the combination with a heating element, a supporting standard having internal and external air spaces, and a switching device mounted beneath said standard for controlling the circuit connections of said heating element,

of mechanical means embodying shafts and gear wheels for operating said switching oevlce.

2. In an electrically heated stove, the combination with a heating element, and a switching device for controlling the circuit connections thereof, of acasing embodying internal and external air spaces between said. heating element and said switching device, said switching device being mounted bcueath said casing.

3. In an electrically heated stove, the con bination with a heater a casin for sun orting said heater, said casing embodying an air chamber and having a deep annular groove or depression therein, and a switching device secured to the underside of said casing and adapted to control the circuit connections of said heater, of means for operating said switching device from the side of said stove.

a. In an electrically heated stove, the com bin: tion with a heater, a plurality of shells or casings embodying internal and external air spaces and disposed below said heater, communicating means between said casings,

and a switching device mounted below the lowermost casing and adapted to control the circuit connections of said heater, of

bination with a heating element, a supporting casing having internal and ex ernal air spaces, a switching device centrally mounted beneath said casing and adapted to control the circuit connections of said heating elcment, and an inclosing shell. for said switch ing device, of a centrally disposed shaft associated with said switching device and projecting into said casing, a rod projecting through its side of saidcasing and having a button on the outer end, and cooperating gear wheels associated with said shaft and said rod.

7. In an electrically heated stove,'the combination with a circular heating device, a cylindrical shell or casing embodying an external air space and a centrally disposed portion of reduced diameter to receive the conductors for said heating device, and a: centrally disposed'switching device secured to the bottom of said shell or casing and adapted to control the circuit, connections of said heating device, of aeentrally disposed subscribed our names this 20th day of J uly, vertical shaft associated with said switching 1911.

device and proJecting into smid shell or cas THOMAS s P ing a horizontally disposed rod projecting 5 threugh the side of said shell or casing, and EDWARD ROSE cotiperating gear wheels associated with said Witnesses: I shaft and said rod. FRANK.THORNTON, J r.,

In testimony whereof, We have hereunto B. B. HINES. 

